Automatic cut-out



(No Model.)

H. P. BLAOKWELL, Jr. AUTOMATIC OUT-OUT.

No. 601,492. Patented Mar. 29,1898.

E a ll) UNITED STATES HENRY F. BLAcKwELL, JR,

PATENT OFFICE.

OF BROOKLYN, NEWV YORK.

AUTOMATIC CUT-OUT.

SPECIFICATION forming part of Letters Patent No. 601 ,492, dated March 29, 1898.

Application filed August 28, 1897. Serial No. 649,877. (No model.)

T0 at whom it may concern:

Be it known that I, HENRY F. BLACKWELL, J r., of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Automatic Out-Out, of which the following is a full,clear,and eXact description.

This invention relates to fuse-holders to be placed in an electric circuit and adapted to automatically cut out the line should an excessive or over load of current occur; and the object is to provide an instrument of this character that shall be simple in its construction and quick and positive in its action, thus preventing the burning out of an instrument with which the line may be attached.

I will describe a cut-out embodying my invention, and then point out the novel features in the appended claims.

' Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a partial section and partial elevation of a cut-out embodying my invention, and Fig. 2 shows a fusible link employed.

Referring to the drawings, 1 designates a base of insulating material on which are mounted metal plates 2 and 3. On the plate 2 is a binding-post 4E, and on the plate 3 is a binding-post 5. These binding-posts are to receive the line-wire.

Secured to the plate 2 and therefore in electrical connection with the binding-post 4 is a spring-yielding arm or conductor 6, normally engaging at its free end with a metal link or safety-fuse consisting of two sections 7 8, having their meeting ends overlapped and connected byafusible solder. One section of the link is in engagement with the conductor (3, which is provided with a hook end to pass through a hole in the link-section, and the other section of the link is engaged with a hook 9, attached to the base.

Normally engaging with the link at the joint of its sections is a carbon point 10. This carbon point is secured to a spring-yielding arm 11, mounted on the plate 3, and therefore in electrical connection with the binding-post 5. As the carbon point is held by spring-pres sure against the link there is no possible chance for the parts separating under ordinary conditions, and, further, a close contact is insured for the passage of the current.

WVhen the parts are in their normal position, the current will pass over the conductor 6 and through the link, the carbon point, and its supportin g-arm, thus connecting the binding posts. Should an excessive or over load of current occur from any cause, the carbon point, being of greater resistance than the other parts of the instrument, will be instantly heated to a sufficiently high degree to quickly melt the fusible joint of the link. Then the conductor 6 will spring upward, carrying the upper section of the link with it, and thus the line will be cut out.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. An automatic cut-out for an electric circuit, comprising a spring-actuated arm forming a conductor, a link connected at one end to the arm and at the other end to a part insulated from the arm and a carbon point in the circuit and engaging with the link and adapted to separate the link when heated by an excessive current, substantially as specified.

2. An automatic cut-out for an electric circuit, comprising a spring-yielding arm forming a conductor, a link consisting of sections joined with fusible solder, one end of said link being connected to the arm and the other end connected to a part insulated from the arm, and a carbon point in the circuit and engaging with the link, substantially as specified.

3. A safety cut-out for an electric circuit, comprising a base of insulating material, a binding-post mounted on the base, a springarm in electrical connection with the bindingpost, a fusible link having one end secured to the base and the other end engaged with the spring-arm, a carbon point in the circuit, and means for holding the carbon in yielding contact with the link at its fusible point, substantially as specified.

HENRY F. BLAOKlVELL, J R.

Vitnesses:

GEO. A. FREETH, HENRY M. HOLLEN. 

